Why is there a noise when braking?
2 Answers
Brake noise in a car is caused by worn brake pads that need timely replacement. Brake pads are consumable items, so they gradually wear thinner with vehicle use. When the friction layer is nearly depleted, an alarm device called the wear indicator (a small metal tab on the brake pad edge) will contact the brake disc, producing a sharp metallic scraping sound as a warning to the driver that the brake pads require replacement. Typically, brake pads should be replaced every 60,000 to 80,000 kilometers, while brake discs last 100,000 to 120,000 kilometers. Improper installation (such as reversed mounting) or incorrect brake pad specifications can also cause abnormal noises - in such cases, the pads should be reinstalled. When replacing brake pads, owners should always visit professional auto repair shops, especially those who previously had brake pads replaced at roadside stalls should pay particular attention to this.
I experienced brake squealing when I first started driving. I remember my old car would squeak every time I pressed the brake, which was quite annoying. The main reasons were severely worn brake pads from prolonged use or accidentally getting a small stone stuck in them, causing friction noise. Some cars also do this on rainy days or in humid conditions, and rusty brake discs can cause abnormal noises too. It's best to first identify the type of sound: light rustling may be fine, but sharp noises require immediate inspection. Later, I made it a habit to clean the brake components during every car wash to reduce debris, and regularly maintained the vehicle by having mechanics check brake pad thickness to avoid mid-journey surprises. This issue shouldn't be delayed as it affects driving safety – imagine the danger if brakes fail during high-speed driving. I recommend developing the habit of addressing it early.
